Safety device



c. w. H OBBS, DECD. C. W. HOBBS. 1R" AND S. T. HOBBS, ADMINISTRATORS.

. SAFETY DEVICE. APPLICATION FILED 0CT.2 I916. RENEWED MAR. 4. I920.

Patented July 6, 1920;

UNITED STATES PATENT OFFICE.

CLARENCE W. HOBBS, OF WORCESTER, IIKASSACHUSETTS; CLARENCE W. HOBBS,JR.,

AND SAMUEL '1. HOBBS ADMINISTRATOES OF SAID CLARENCE W. HOBBS, DE-

GEASED.

Specification of Letters Patent.

SAFE'lY DEVICE.

Patented. July 6, 1920.

Application filed October 2, 1916, Serial No. 123,229. Renewed March 4,1920. Serial No. 363,287.

To all whom it may concern Be it known that I, CLARENCE W. Hones, acitizen of the United States, residing at Worcester, in the county ofIVorcester and Commonwealth of Massachusetts, haveinvented a new anduseful Improvement in Safety Devices, of which the following is aspecification, accompanied by drawings forming a part of the same.

My present invention relates to a safety device adapted to be applied tothat type of machines which embody stationary and reciprocating workengaging elements, such for example as punching machines, die presses,and staying machines for applying a stay or reinforcing strip to thecorners of pasteboard boxes.

The object of my invention is to provide means for automaticallyrendering the work engaging elements inoperative whenever an obstructionis placed between them. The useful purpose of my present invention is toprevent injury to the hand of an operator in case it'is placed betweenthe work engaging elements.

In the accompanying drawings I have shown my invention as applied to amachine for applying corner stays to pasteboard boxes, and. I have shownonly so much of the corner staying machine as is necessary to illustratethe character of my invention.

In the accompanying drawings, Figure 1 denotes a side elevation of somuch of a corner staying machine as is necessary to illustrate mypresent invention, a portion of said figure being shown in sectionalview. Fig. 2 is a front elevation of the same, similar parts beingindicated by similar reference characters in the different figures.

Referring to the accompanying drawing, 1 denotes a base or stand uponwhich the machine is mounted. 2 is a framework sup: porting theoperative mechanism. In the framework 2 is journaled a shaft 3 carryingupon one end a belt pulley by which power is applied to the machine. andupon the opposite end is a disk provided with a crank pin 5. The crankpin 5 is connected by a link (5 with a stud or wrist pin 7, projectingfrom a slide 8, whereby a vertically reciprocating movement is given tothe slide in ways supported by the framework of the machine. Carried bythe slide 8 is an angular die 9 having the usual yieldable connectionwith the slide. The angular die 9 constitutes the reciprocating workengaging member and it cooperates with an angular anvil 10 for thepurpose of pressing an adhesive stay strip upon the corner of apasteboard box, when the latter is supported by its corner upon theanvil. i

Means for feeding the stay strip between the die 9 and anvil 10, and forapplying adhesive material to the under side of the stay strip usuallyform component parts of the staying machine, but these mechanisms areomitted in the present drawings as they are not concerned in theembodiment of my present invention. The anvil 10 is mounted upon one endof a bar 11 which is pivoted at its opposite end upon a spindle 12carried in a sleeve 13 capable of sliding .in ways 14; mounted upon theframework of the machine. Attached to the under side of the sleeve 13 isa rack 15 which is engaged by a pinion 16 carried upon the end of aspindle 17 projecting from the side of the framework inconvenientposition to receive a wrench by which the spindle and pinionmay be rotated in order to move the sleeve 13 back and forth in ways 14,to provide for different lengths of stay strips. T he'sleeve 13 is cutaway beneath the bar 11, as shown at 18, Fig. 1, in order to allow thefree end of the bar 11, and the anvil carried thereby to fall by gravityinto a position to bring the anvil 10 below the path of the verticallyreciprocating die 9. I

The bar 11 carrying the anvil 10 is provided upon its under side with ablock 19, the inner end of which rests upon a spindle 20 which is forcedupwardly by a small spiral spring 21 in order to normally hold the anvil10 in. its raised position. In case an obstruction is placed between thedie 9 and the anvil 10, such for example as the finger of an operator,the spring 21 will yield without in'tlictinginjury. In order to enablethe requisite pressure to be applied to the stay strip a sliding blockor gag' 22 is provided, resting upon the framework of the machine and ofsufficient thickness to fill the space between the frame supporting thegag and the block 19. upon one end of a rod 23 pivotally connected atits outer end with a lever 24 extending downwardly from a hub 25 whichis piv oted upon a stud 26 projecting from the The gag 2-2 is carried Iend a cam roll 28. The roll 28 is held against the periphery of a cam 29by means of a torsional spring 30 wound upon the hub 25. The cam 29 isattached to the shaft 3 and is provided with a shoulder 31. The cam 29is so timed with relation to the downward movement of the die 9 thatwhen the latter approaches so near the anvil that thefinge'r of theoperator can not be inserted between the die and the anvil the cam rollwill reach the shoulder 31, allowing the lever 24 to be quickly swung bythe action of the spring 30 to slide the gag beneath the block 19 andthereby render the anvil rigid.

As the die rises, the cam 29 will gradually draw the gag back frombeneath the block 19 until it reaches the position shown at 22, Fig. 2.

The anvil is therefore capable of being depressed during the downwardmovement of the die 9 by any object interposed between the die andanvil. However, when the die reaches the anvil sufficiently near toprevent the introduction of the finger of the operator, then the gagwill be inserted beneath the block 19 by the action of the spring 30 ascontrolled by the cam 29.

I claim:

1. In a machine of the class described, a yieldable stationary workengaging member, a reciprocating work engaging member cooperating withsaid yieldable member, means for actuating said reciprocating member,and means operable by said actuating means for rendering said yieldablemember rigid at a predetermined point in themovement of saidreciprocating member.

2. In a machine of the class described, a yieldable stationary workengaging member, a reciprocating work engaging member cooperating withsaid yieldable member, means for actuating said reciprocating member,and automatic means for rendering said yieldable member rigid at apredetermined point during the approach of said reciprocating membertoward said yieldable member.

3. In a machine of the class described, a reciprocating member forapplying pressure to the work, a'normally yieldable stationary memberfor receiving pressure applied to the work, a spring for supporting saidstationary member in its normal position, and means for locking saidyieldable member in its normal position as the reciprocating memberapproaches said yieldable member within a predetermined distance. I

4. In a machine of the class described, a

reciprocating work engaging member, a bar pivoted at one end andextending across the line of'travel of said reciprocating member and atright angles thereto, a work engaging member carried by the free end ofsaid' bar, a spring yieldably supporting said bar, a gag for lockingsaid bar against movement, and means for actuating said gag to lock saidbar in timed relation to the movement of said reciprocating member.

5 In a machine of the class described, a reciprocating work engagingmember, a yieldable stationary work engaging member cooperating withsaid reciprocating member, means for yieldably supporting saidstationary member in its normal position rela tively to saidreciprocating member, and means for moving'said yieldable stationarymember in a line at right angles to the line of movement of saidreciprocating member.

6. In a machine of the class described, a reciprocating work engagingmember, a yieldable stationary work engaging member cooperating withsaid reciprocating member, a rotatable member for actuating saidreciprocating member, a movable gag for locking said yieldablestationary member in its normal position, and means carried by saidrotatable member for controlling the move ment of said gag.

7. In a machine of the class described, a reciprocating work engagingmember, a rotatable member for actuating the same, a yieldablestationary work engaging member cooperating with said reciprocatingmember, a movable gag for locking said yieldable stationary member inits normal position, a spring for moving the gag into its lockingposition, and a cam carried by said rotatable O. I. lVlLLIAMs, Burns B.Fownnn.

